According to the documentation for kiwi templates at https://github.com/coolony/kiwi, the only mechanism that they provide for escaping out of their template mode is the {{raw}} {{/raw}}
clause. so you would probably accomplish what you want by doing the following:
{{raw}}<span class="{{myVar}}">{{myVar}}</span>{{/raw}}
That being said, I don't suspect this is a very good engine to use for templates with Angular.js compatibility, as the mixing of the use of the {{ }}
operand between the two frameworks will make troubleshooting issues extremely laborious.